Automatic pistol



D 1929- w. R. BLUEHDORN 1,738,751

AUTOMATIC PISTOL Filed D60. 21, 1927 avwenkw W. RE: 11.: Ehdurfl thebarrel during its rearward and Patented P:

AUTOMATIC PISTOL in Application filed December 21, 1927. Serial N0."241,696.

on man an M31 or MARCH 3, 1883, AS ammmnn nan, so, 1928; 370 o. 0.757

10 energy diminished by cushioning means which supply the reaction forcounter recoil or by actuating parts of the firing, feeding and othermechanisms.

In the .45 caliber Colt automatic istol ownwardly swinging movement toeifect its unlocking from the slide performs no additional functions andis brought up against the receiver with great force. During thecounterrecoil movement of the barrel and slide the same stop lug on thebarrel through v V whentherear face of its In which its rearwardmovement is arrested is brought up against the pivot pin of the slidestop to arrest the forward movement of both barrel and slide. As aresult the metal of the stop lug becomes crystallized and soon givesaway.

The object of the present invention is to provide means susceptible ofincorporation in existing pistols, to check the force of the the detailsof construction hereinafter described and claimed, it being understoodthat changes in the precise embodiment of the invention herein disclosedmay be made within the scope of what is claimed without depart-' ingfrom the spirit of the invention.

A practical embodiment of the invention" is .illustrated in theaccompanying drawings,

wherein Fig. 1 is a fragmentary view in side eleva-f tion, partly insection of a pistol constructed in accordance with the invention, theparts being in normal position;

Fig. 2 is a similar view showing the posi tion of the parts at the endof recoil;

Fig. 3 is a detail view showing a modified form of muzzle attachment. ji

Referring to the drawings by numerals of reference: 1 t l The standardColt caliber .45 automatic pistol to which the improvements are to beapplied comprises a receiver 5, a reciprocating slide 6 mounted on thereceiver and a barrel 7 The barrel is provided with transverse lockingribs 8 which engage in grooves 9 in the slide to ositively lock thesetwo members when in ring position. The rear end of the barrel is formedwith a depending lug 10 bifurcated to pivotally receive a link 11 whichestablishes connection with the re ceiverthrough the slide stop pivot12. By this arrangement the barrel is movable a limited distancelengthwise and in a vertical plane to accomplish disengagement orengagement of the locking ribs and the grooves.

The barrel after being unlocked, is arrested 10 strikes an abutment13 ofthe receiver. he slide, which constitutes a breech bolt, continues tothe rear to effect ejection, cooking and loading and energizes thespring 14: which restores it to battery. When nearing completion of itscounter recoil stroke, the slide encounters the rear portion of thebarrel and forces the barrel forward and upward to locking position. Thejoint forward movement of the barrel and slide is arrested when thebarrel lug 10 strikes the stop pivot 12. The barrel lug ,in taking theblows to arrest recoil and counterrecoil of the barrel soon becomes crystallized and breaks off.

In order to correct this defect it is proposed to associate a gas check15 with the recoiling members. The gas check may be atfpert-afe w rPressure in ppo tio o coil. This will reduce the blow of thebarrel IugIO against the receiver abutment 13.

or the pur ose of cushioning the return of the barrel an slide intobattery an extension 19 is formed on the forward face of the link 11 andthe return springguide 20 is modified by being plugged as at 21 to forma striking surface for the extension 19. In this manner the returnspring which restores the gun to battery is conveniently utilized tocheck the force of the very members it is moving.

It will be obvious that the extension 19 may with the slide and anextension on the forbe incorporated in the barrel lug and it is onlylnecessary that such means be associated wit a member that is returninginto battery. The foregoing improvements in addition to serving for thepurpose specified will prove of considerable advantage in permlttingrapid and correct reaiming of the pistol.

I claim:

1. A firearm embodying a receiver, a breech bolt slide reciprocallymounted on the receiver, a return spring for said slide, front and rearmovable guides confining said spring, a gas check removably attached tothe slide and establishin said gas check, a. link connecting the rear ofthe barrel with the receiver for controlling movement of the barrel intoand out of looking engagement with the breech bolt slide and meansengageable with the rear uide whereby the barrel may be eased intoattery.

2. A firearm embodying a receiver, a

breech bolt slide reciprocably mounted on the receiver, a. return springfor said slide, a barrel movable out of and into locking engagement withthe slide during the initial and final movement of the slide, a gascheck on the slide and means whereby the barrel and .slide are easedinto battery through a counteraction on the return spring.

3. A firearm embodying a barrel and a breech bolt slide each having arecoil and counter recoil movement, a return spring energized on recoil,a gas check associated with one of the recoilable members and acting onboth of them and means associated with the barrel for counteraction bthe return springs as the barrel arrives in attery.

4. firearm embodying a receiver, a breech bolt slide reciprocallymounted on the receiver, a return sprin for said slide, a as checkattached to the s ide and establishing connection with the return springand a barrel forwardly supported in said gas check and partaking of theinitial and final movement of the breech bolt slide.

5. A firearm embodying a receiver, a breech bolt slide reciprocallymounted onthe receiver, a return spring energized by the slide onrecoil, a movable rear guide for said sprin a barrel, a link connectionbetween the arrel and receiver for moving the barrel into and out oflocking engagement connection with the front guide, a barrel orwardlysupported in

